[learning notes] thread creation

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include <string.h>

struct class {
    
	char str[20];
	int num;
};

struct class *do_func1(struct class *data)
{
    
	memset(data, 0, sizeof(struct class));
	strcpy(data->str,"liuxing");
	data->num = 23;
	return data;
}

struct class *do_func2(struct class *data)
{
    
	memset(data, 0, sizeof(struct class));
	strcpy(data->str,"star");
	data->num = 25;
	return data;
}

void *thread_func1(void *arg)
{
    
	pthread_t pthread;
	struct class *data = (struct class*)arg;
	//struct class *redata = (struct class*)malloc(sizeof(struct class));
	printf("child1 thread, ID is %ld\n", pthread_self());
	
	do_func1(data);
	return arg;
}

void *thread_func2(void *arg)
{
    
	pthread_t pthread;
	struct class *data = (struct class*) arg;
	printf("child2 thread, ID is %ld\n", pthread_self());

	do_func2(data);
	return arg;	
}

int main()
{
    
	pthread_t pthread1;
	pthread_t pthread2;
	struct class *data = (struct class*)malloc(sizeof(struct class));

	printf("main thread, ID is %lu\n", pthread_self());
	
	if (pthread_create(&pthread1, NULL, (void*)thread_func1, (void*)data) != 0) {
    
		printf("thread creation failed!\n");
		return -1;
	}
	pthread_join(pthread1, &data);
	printf("class str = %s, num = %d\n", data->str, data->num);


	if (pthread_create(&pthread2, NULL, (void*)thread_func2, data) != 0) {
    
		printf("thread creation failed!\n");
		return -1;
	}
	pthread_join(pthread2, &data);
	printf("class str = %s, num = %d\n", data->str, data->num);

	return 0;
}